[RBTREE] Update comments on red-black tree usage (#2694)

- Remove outdated information
- Document the seven red-black trees that Box64 currently uses:
  1. memprot
  2. mapallmem
  3. blockstree
  4. db_sizes
  5. envmap
  6. rbt_dynmem
  7. volatileRanges
- Clarify each tree's role

The original intention was to help future contributors who want
to propose a faster lookup mechanism to replace rbtrees in the
future, as understanding the current usage patterns is a
necessary first step.

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